Uas nrawm dua: Aero vs lub log sib sib zog nqus

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Uas nrawm dua: Aero vs lub log sib sib zog nqus
Uas nrawm dua: Aero vs lub log sib sib zog nqus

Video: Uas nrawm dua: Aero vs lub log sib sib zog nqus

Video: Uas nrawm dua: Aero vs lub log sib sib zog nqus
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Nyob ntawm kev caij tsheb sib npaug ntawm tiaj tus thiab nce toj, lub log dab tsi koj yuav tsum mus nrog - aero lossis lub teeb yuag?

Saib kev sib tw theem thiab koj yuav pom qhov tob ntawm cov neeg caij tsheb hloov pauv nrog thaj av. Feem ntau cov rims sib sib zog nqus tuaj tawm ntawm cov theem ceev, tiaj tus, thaum cov rims ntiav ntiav tau bolted rau saum toj.

Ua tau zoo tshaj plaws ntawm qib, thiab muaj txiaj ntsig zoo dua thaum caij tsheb ib leeg lossis hauv ib pab pawg me, ib pawg ntawm cov rims sib sib zog nqus tuaj yeem ua rau muaj teeb meem rau cov neeg caij tsheb txaus siab tau txais kev so.

Los ntawm kev sib piv, cov txheej txheem tawv nqaij txhais tau hais tias tus neeg caij tsheb xav tias lub hnub tseem ceeb yuav ua rau qhov nce. Tab sis nrog rau feem ntau txoj kev muaj li ntawm ob qho tib si tiaj thiab toj roob hauv pes, uas lub log yuav ua tau zoo tshaj plaws; aero los yog lub teeb yuag?

'Yog tias tus neeg caij tsheb kauj vab caij 10km ntawm lub tiaj ua raws li 10km nce toj, ces pom tseeb tias qhov nce toj yuav siv sijhawm ntev dua, 'Marco Arkesteijn, tus kws qhia ntawv hauv kev ua si nawv thiab kev tawm dag zog biomechanics ntawm Aberystwyth University.

'Tam sim no cia peb hais [arbitrarily] tias qhov sib sib zog nqus seem aerodynamic log muab rau koj 10% nce hauv kev nrawm tshaj qhov tob tob ntawm lub tiaj tus tab sis, vim lawv qhov hnyav ntxiv, qhov zoo sib xws hauv kev ceev ntawm kev nce toj.

'Nws sawv rau qhov laj thawj uas koj yuav tsum xaiv cov rims ntiav vim tias koj yuav siv sijhawm ntau rau ntawm qhov nce siab kom qhov chaw koj xav txuag sijhawm.'

Ah, tab sis nws tsis yooj yim li. Tshaj rau Kevin Quan, tus thawj coj ntawm engineering ntawm Knight Wheels: 'Kuv tus qub npoj yaig ntawm Cervélo tau ua ntau yam kev sim thiab suav los teb cov lus nug no.

'Lawv nrhiav pom tias aero nce trump poob phaus rau txhua yam txog li ntawm 5% txoj kab nqes rau nruab nrab cov neeg caij ua si thiab 8% txoj kab nqes rau tus kws tshaj lij.'

Duab
Duab

Yog li yog tias koj yog Chris Froome tackling Col de la Ramaz ntawm Tour de France, qhov nce 13.9km nrog qhov nruab nrab 7.1% gradient, tob rims yog txoj hauv kev mus. Yog tias koj yog tus accountant John Smith tau mus rau tib lub nce toj, nws zoo dua mus ntiav.

Rau qhov sib txawv me ntsis ntawm cov khoom, cia peb hloov peb qhov kev ntsuas ntawm kev sib piv rau kev ntseeg siab.

'Thaum 40kmh, kev hloov pauv los ntawm qhov qis qis mus rau qhov sib sib zog nqus tuaj yeem tsim nyog nyob ib puag ncig 10W, uas tuaj yeem txuag koj li 30 vib nas this hauv ib teev, 'hais Rob Kitching, tus tsim ntawm kev ua yeeb yam-ua qauv ua qauv Cycling Power Lab.

'Cia peb xav tias qhov hnyav ntawm kev siv lub log sib sib zog nqus aero log yog ib nrab ib kilogram. Txawm tias nyob rau ntawm gradient ntawm 10%, tus nqi ntawm kev nqa qhov hnyav ntxiv nce mus yuav tsawg dua 5W.

'Ib chav kawm yuav tsum muaj kev nce siab ntau qhov uas yuav muaj qhov hnyav hnyav ua ntej nws yuav ua rau kev txiav txim siab hloov kho aero.'

Duab
Duab

Lub neej yog luag

Ib qho tseem ceeb uas peb yuav tsum xav txog yog thaj tsam luag (CdA), uas yog cov khoom ntawm ib qho khoom siv quab yuam thiab nws thaj tsam pem hauv ntej. Siv aero log tau pom tias txo tus neeg caij tsheb kauj vab CdA los ntawm 3-5%, yog li yog tias koj tsim 350W ntawm lub zog, siv lub log aero tuaj yeem pom koj qhov nrawm ntawm lub tiaj tus nce ntawm 44.6kmh mus rau 45.4kmh, nce 1.63%.

Ntawm 2% gradient, aero tseem yog txoj hauv kev mus - qhov sib sib zog nqus cov log yuav tsum muaj tsawg kawg yog 2.8kg hnyav dua li lawv qhov ntiav ntiav rau lawv tsis yog qhov kev xaiv nrawm dua. Tab sis tus nqi no poob qis heev thaum txoj kev nce siab.

Ntawm 4%, aero log txog 940g hnyav dua tseem yuav yog qhov kev xaiv sai dua. Ntawm 6% qhov no poob rau 390g, tab sis los ntawm lub sij hawm koj ntaus 10% tsuas muaj 50g nyob rau hauv nws rau lub aero kom zoo dua los yeej dua ntiav log.

Cia li coj qhov ntawd mus rau hauv lub ntiaj teb tiag. Zipp's 202 Firecrest clinchers yog nws qhov kev xaiv qis qis ntawm 1, 450g, thaum nws 808s yog qhov kev xaiv super aero ntawm 1, 885g, qhov hnyav ntawm 435g.

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Kev ua qauv ua qauv

OK peb tau txais qee qhov, tab sis tsuas yog dabbled hauv cov ntaub ntawv los sim peb cov kev xav txog tam sim no, nws yog lub sijhawm los mus rau tag nrho. Qhov Zoo Tshaj Plaws Tsheb Sib Tw, uas tau yuav los ntawm TrainingPeaks hauv 2014, tau tsim kev ua haujlwm-ua qauv lub cav uas muaj peev xwm nqus tau ib tuj ntawm cov ntaub ntawv - tus neeg caij tsheb qhov chaw ua haujlwm, qhov hnyav, tsheb kauj vab teeb tsa thiab lub log xaiv - ua ntej kwv yees lub tsheb kauj vab sib cais rau ib qho kev kawm tshwj xeeb.

Nws yog tus qauv tsim nyog txaus rau cov pab pawg xws li Trek-Segafredo tau siv nws xaiv, piv txwv li, seb lawv cov neeg caij tsheb yuav tsum siv TT Speed Concept lossis Madone nrog clip-ons thaum ntsib lub sijhawm nce toj- sim.

FLO Wheels yog lub tuam txhab Asmeskas lub log uas tau siv Cov Tsheb Npav Zoo Tshaj Plaws los ua qauv nws cov log hla ntau qhov kev kawm Ironman tsheb kauj vab los saib seb thaj av cuam tshuam li cas rau kev xaiv.

Cov no suav nrog cov chav kawm tiaj tus, dov thiab ntxhab, ntxiv rau cov kev kawm hnyav xws li Alpe d'Huez Triathlon, uas muaj cov cim kev nce siab uas siv hauv Ncig Saib Tebchaws Fabkis.

Lub tuam txhab piv lub teeb kev cob qhia lub log (1, 100g) thiab aero log (1, 624g) tiv thaiv lub log hnyav dua (2, 259g). Ntawm chav kawm Ironman Florida, uas tsuas yog 300m ntawm kev nce siab tshaj 180km, lub log hnyav dua tuaj rau ntawm 5h 21m 44s.

Lub log sib zog tsuas yog txuag 2s, thaum lub eros tuaj ntawm 5h 14m 10s - 7m 34s txuag. Txawm hais tias nyob rau ntawm 13.2km Alpe d'Huez nce, lub teeb lub log zoo dua qhov kawg aero combo los ntawm tsuas yog 23s.

'Peb cov qauv qhia tau hais tias aerodynamics tseem ceeb tshaj qhov hnyav thaum nws los txog rau kev xaiv lub log,' xaus lus FLO tus tsim Chris Thornham.

Yog li rau feem ntau qhov xwm txheej hauv ntiaj teb no, nws zoo li aero yeej, tab sis qhov sib sib zog nqus piv rau kev sib cav sib ceg tau ploj lawm, raws li Lub Tsheb Loj 'Chris Hewings.

'Raws li kev paub dhau los, cov ntaub ntawv pov thawj tsis txaus ntseeg thiab ua rau rog me ntsis, Kuv yuav txhawj xeeb ntxiv txog lub log flex, 'nws hais. 'Feem ntau ntawm lub teeb lub log yuav hloov tau yooj yim dua rau lwm tus uas tsis yog tus nab sib tw tiag tiag.

'Kev hloov hluav taws xob vim lub log nruj yog qhov tseem ceeb xws li qhov hnyav qis, uas yog qhov chaw nce toj feem ntau poob, tshwj xeeb tshaj yog rau cov neeg caij tsheb zoo li kuv, uas hnyav dua 80kg.'

Hewings ua qhov tseeb, thiab ntxiv rau qhov teeb meem ntawm lub cev hnyav nws tsim nyog xav txog cov hauv qab no ib yam nkaus: yog tias koj hnyav 90kg thiab koj lub tsheb kauj vab yog 7kg, nrog lub log tsheb tsis zoo 1.1kg, koj cov hoops tsuas yog 1.12%. ntawm koj 98.1kg tag nrho set-up.

Tab sis yog tias koj zoo li Quintana thiab nyob ib puag ncig 60kg, nrog tib lub thav duab thiab lub log hnyav, koj lub wheelset ua rau 1.61% ntawm tag nrho, uas tsuas yog 0.5% tag nrho, tab sis sawv cev ze li 50% dhia hauv nws qhov kev faib ua piv rau cov neeg caij tsheb loj dua.

Angliru Big caij Ascent Corner 02
Angliru Big caij Ascent Corner 02

Yog li cov rims ntiav rau cov neeg caij tsheb sib dua thiab aero hnyav dua? Peb mam li muab lo lus kawg rau Cov Kws Tshaj Lij Tshwj Xeeb aerodynamic Chris Yu: 'Ua ke nrog qhov sib txawv ntawm qhov hnyav, cov lus nug ntawm lub log twg xaiv qhov kub thiab txias - tshwj xeeb yog lub kaum sab xis, uas yog nyob ntawm tus neeg caij tsheb ceev, ib yam nkaus.

'Tab sis nyob ntawm qhov tshwj xeeb sib xyaw ntawm aero thiab qhov hnyav sib txawv, qhov kev lag luam tawm rau gradient tuaj yeem nyob qhov twg los ntawm 4% mus txog ze li 10%.' Qhov ntawd tsis yog qhov tseeb, tab sis nws yog lus teb … oh, tos, muaj ntau ntxiv: 'Qhov ntawd yog ua ntej coj mus rau hauv tus account raug crosswinds thiab ceev ntawm tus neeg caij tsheb.'

Crosswinds, koj hais? Txoj cai. Tej zaum peb yuav tsum tsis nco qab tag nrho…

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